Pendulum Answer.

Exploration Stage: Crystals
From: Isabelle
Description: Find a piece of paper, put a dot in the middle, and draw a line to divide it into three places: "Yes," "No," and "Neither.
Completed: Everything is ready. Hang the pendant in the middle of the paper and ask if the card cheater is alive. The pendant will swing in the direction of the applicable part to indicate the answer. So I can see the answer clearly with my own eyes. Now, three stores to answer the question. Yes." The card scammer is alive. Then, what about the captain? The answer is "neither."